The Court of Appeals ruling Thursday upholds a judge's decision that the money, stashed in ammunition cans inside the walls, belongs to Robert Spann's estate.
Spann died in 2001. According to the ruling, his daughters found stocks, bonds, cash and gold hidden in his suburban Phoenix home before they sold it seven years later.
The couple who bought the home in Paradise Valley claimed the cash after a worker found it in the walls during kitchen and bathroom remodeling.
The Court of Appeals said that legally, the money was only mislaid, not abandoned, so it still belonged to Spann's estate.